Our users (including myself) often get confused and frustrated when trying to delete partition table and getting Device busy error because they forgot (or do not ever know that they have) to delete all its partitions first. Manual page mentions this briefly, but does not stress it out enough. Personally I always forget this
annoying feature and have to google the answer every time I want to delete partition table on some drive.
Provide working example and explanation of Device busy error and how to properly deal with it.